BS 7681 Pt.5-1995 通过网络上零相位技术对石英谐振器参数测量.第5部分:用自动网络分析仪和误差修正技术评定电气参数的测量方法

上一篇: BS ISO/IEC 10737-1995 信息技术.系统间的电信学和信息交换.有关开式系统互连传送层标准的管理信息码元
下一篇: BS ISO/IEC ISP 10614-5-1995 信息技术.国际标准化提问档RC.X.25协议交换.利用虚拟呼叫公用交换电话网络租用专线永久性存取的带有检测冲突的载波侦听多路存取子网络和(PSDNs)间RC51.1111型,X.25协议交换的定义

【英文标准名称】:Ambientairquality-StandardgravimetricmeasurementmethodforthedeterminationofthePM2,5massfractionofsuspendedparticulatematter
【原文标准名称】:环境空气质量.悬浮颗粒物质的PM2.5质量系数测定用标准称重测量法
【标准号】:BSEN14907-2005
【标准状态】:现行
【国别】:英国
【发布日期】:2005-11-11
【实施或试行日期】:2005-11-11
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:空气污染;空气净化;空气质量;环境空气;定义;测定;尘埃;称重测量法;重量分析法;维修;质量浓度;测量;测量不确定度;测量仪器;颗粒;颗粒物质的测定;质量保证;质量控制;基准测量方法;抽样方法;悬浮尘埃;称重
【英文主题词】:Airpollution;Airpurification;Airquality;Ambientair;Definitions;Determination;Dust;Gravimetric;Gravimetry;Maintenance;Massconcentration;Measurement;Measuringincertainity;Measuringinstruments;Particles;Particulatemattermeasurement;Qualityassurance;Qualitycontrol;Referencemeasuringmethods;Samplingmethods;Suspendeddust;Weighing
【摘要】:ThisEuropeanStandarddescribesastandardmethodfordeterminingthePM2,5massconcentrationofsuspendedparticulatematterinambientairbysamplingtheparticulatematteronfiltersandweighingthembymeansofabalance.Measurementsaremadeoverasamplingperiodofabout24h,andinlinewiththeDirective,areexpressedasμg/m3,wherethevolumeofairisthevolumeatambientconditionsneartheinletatthetimeofsampling.Therangeofapplicationofthestandardisfrom1μg/m3(i.e.thelimitofdetectionofthestandardmeasurementmethodexpressedasitsuncertainty)upto120μg/m3(i.e.themaximumconcentrationlevelobservedduringthefieldstudyundertakenbyCEN/TC264/WG15tovalidatethestandard).NOTEAlthoughthestandardisnotvalidatedforconcentrationsover120μg/m3,itsrangeofapplicationcouldwellbeextendedtocommonlyencounteredambientconcentrationsuptocirca200μg/m3whenusingglassorquartzfibrefilters.Atthesehighconcentrationsandparticulatemassloadingsnofiltercloggingistobeexpected.Alsotheflowratecanbeeasilymaintainedatthenominalsetting.TheequivalenceprocedureinAnnexAspecifiestwoapproaches,dependingonwhetherthecandidatemethoddiffersslightlyorfundamentallyfromthestandardmethod.Intheformercase,involvingonlyslightdifferencesfromthestandardmethod(“variationsonatheme”)AnnexAprovidesarestrictedproceduretocompareonlythepertinentdifferences,insteadofafullfieldtest.Thispartoftheannexservestogivepracticalguidancefordeterminingequivalenceformeasurementmethodscommonlyusedinmonitoringnetworks,andincludesexamplesofcommonvariationstothestandardmethod,suchasdifferentfilterstoringorconditioningproceduresandthevariationofthestandardmethodfortheapplicationasautomatedfilterchanger.Inthelattercase,involvingafullsetoffieldtests,theprocedureservestodetermineequivalenceonlywithintherangeofconditionsunderwhichthefieldtestsarecarriedout.TheequivalencecanbeshowntoholdforconditionsprevailingwithinEuropeancountriesbycarryingoutthefieldtestinsituationscoveringasuitablerangeofrelevantambientparameters(suchasconcentrationandcompositionofthesuspendedparticulatematter,temperature,andhumidity).AlthoughthisEuropeanStandarddoesnotexplicitlyaddressautomaticmonitoringmethodsforthemeasurementofthePM2,5massfractioninambientair,theequivalencetestprocedureinAnnexAappliesbothtonon-automaticandautomaticmethods.
【中国标准分类号】:Z15
【国际标准分类号】:13_040_20
【页数】:32P;A4
【正文语种】:英语


【英文标准名称】:Petroleumindustrie.Greasecatriges.Dimensions.
【原文标准名称】:石油工业.润滑油压射器.尺寸
【标准号】:NFM88-950-1986
【标准状态】:现行
【国别】:法国
【发布日期】:1986-04-01
【实施或试行日期】:1986-04-05
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:J21
【国际标准分类号】:21_260;75_180_99
【页数】:2P;A4
【正文语种】:其他